Artykuły (WFTIiMS)
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Pozycja Interval Model of Dynamics of Dispersion of Harmful Pollution from Vehicular Traffic(Wydawnictwo Politechniki Łódzkiej, 2016) Dyvak, Mykola; Stakhiv, Petro; Pukas, Andriy; Voytyuk, Iryna; Porplytsya, Natalia; Maslyiak, YuriiThe method of structure identification of interval discrete dynamic models, based on principles of the bee colonies functioning is represented. An example of the implementation of method for modeling of air pollution by harmful vehicle emissions is considered.Pozycja Geometric Transformations Embedded into Convolutional Neural Networks(Wydawnictwo Politechniki Łódzkiej, 2016) Tarasiuk, Paweł; Pryczek, MichałThis paper presents a novel extension to convolutional neural networks. While CNNs are known for invariance to object translation, changes to the other parameters could make the image recognition tasks diffcult – that includes rotations and scaling. Some improvement in this area could be achieved with embedded geometric transformations used inside the CNNs. In order to provide a practical solution, which allows fast propagation and learning of the modified networks, “fast geometric transformations” are introduced.Pozycja Integrity Rules for Multiargument Relationships in Possibilistic Databases(Wydawnictwo Politechniki Łódzkiej, 2016) Myszkorowski, KrzysztofThe paper contains an analysis of multiargument relationships in possibilistic databases. A multiargument relationship may be formally presented using the relational notation R(X1, X2,...,Xn), where R is the name of the relationship and attributes Xi denote keys of entity sets which participate in it. The dependencies between all n attributes describe the integrity constraints and must not be infringed. They constitute a restriction for relationships of fewer attributes. In the paper it is considered a possible coexistence of associations between k < n attributes of the n-ary relationship. The analysis is carried out using the theory of fuzzy functional dependencies. The notion of functional dependency has been appropriately extended according to the representation of data.Pozycja Medical-Grade Network Security - Air-Gap Isolation and PossibleWeak Points(Wydawnictwo Politechniki Łódzkiej, 2016) Arendt, DanielModern medical imaging devices (MID) are usually connected to the network. Transfer of digital data to the Picture Archiving and Communication Systems (PACS) and then to Hospital Information Systems (HIS) without the internal network is not technically nor economically reasonable. It is estimated that by the interconnection of medical devices and providing remote access to them, health care costs will be cut by $ 63 billion till 2030. Sharing MID’s over public network by remote access can dramatically cut costs of medical care but creates risks well known from oce networks. The firewall/IDS and the air gap isolation techniques are there applicable. Medical society ask for advice what to choose or what are the threats of network operation of medical devices. Here will be given description of known attacks on the security of air gapped networks and cases of disorder operation of systems and ecient data transfer from networks traditionally known as invulnerable and impermeable. Analyzing the presented cases of successful attacks allows to identify weak points of the air-gap mechanism. In conclusion opinion how to straighten security of isolated networks will be given, on the other hand an eective IDS has advantage and many strong points.Pozycja Temperature dependence of the Kerr constant of fomblin M03.(Wydawnictwo Politechniki Łódzkiej, 2016) Ledzion, Rafał; Górski, Piotr; Izdebski, Marek; Kucharczyk, WłodzimierzThe Kerr constant B of perfluoropolyether Fomblin M03 has been determined within the temperature range 295-370K. At 300K the constant B was found to be equal to 2.8·10-15 m/V2. The measurements indicate that B varies inversely with temperature. Relatively low electro-optic response of the perfluoropolyether shows its usability in measurements of the quadratic electrooptic effect and the electrostriction in crystals.Pozycja Elimination of the impact of rc constant on transient photocurrents measured in organic layers.(Wydawnictwo Politechniki Łódzkiej, 2016) Kania, Sylwester; Kuliński, JanuszWe present a calculation method for elimination of the effect of the RC constant of the measuring circuit in the time-of-flight (TOF) measurements where a pulse generation of the photocurrent in a thin layer of low-molecular organic material is exploited. Presented method allows to eliminate the influence of the component of displacement current related to dielectric losses and obtaining the actual conduction current time dependence. The method was tested on the thin layers of 1,5-dihydroxynaphthalene.Pozycja The effect of symmetry of a molecule electronic density on the dipole moment of unit cell and hole conductivity of thin polycrystalline films of anthrone and anthraquinone.(Wydawnictwo Politechniki Łódzkiej, 2016) Kania, Sylwester; Kościelniak-Mucha, Barbara; Kuliński, Janusz; Słoma, Piotr; Wojciechowski, KrzysztofThe electronic structure of anthrone and anthraquinone molecules in the gas state and in the simulated crystal unit cell were calculated with time dependent-density functional theory (TD-DFT) method. The values of dipole moment of single molecule and of single crystal unit cell were also determined with TD-DFT method. The results of TD-DFT were compared with known crystal structures of both compounds [1,2]. For both molecules it was observed improvement of matching the length of corresponding bonds when calculated for the unit cell. Unexpectedly high value of dipole moment was calculated for the single unit cell of anthrone. This fact can be responsible for the nano-dimension properties of anthrone as the carriers mobility or high boiling point.Pozycja Study of electrically induced orientational ordering in mineral oils on the example of orlen oil trafo en.(Wydawnictwo Politechniki Łódzkiej, 2016) Izdebski, Marek; Adamus, Monika; Jóźwiak, Ewelina; Ledzion, RafałA simple model of orientational ordering of molecules in the liquid under the influence of an applied sinusoidal electric field of low frequency is presented. The predicted theoretical dependencies of linear birefringence and light transmission coefficients on the intensity of the applied field were confirmed by experimental data obtained for transformer oil ORLEN OIL TRAFO EN. It was found that the intensity of orientational effects in the oil depends strongly not only on the current conditions, but also on the thermal history of the sample. Furthermore it is shown that the minimum amount of dissolved contaminants (e.g. polyethylene) strongly increases the effects. The results suggest that it is necessary to reconsider the techniques for measuring the Kerr effect in liquids associated with deformation of electron cloud, because the traditional approach does not take into account the orientational effects occurring simultaneously with the Kerr effect.Pozycja Two-dimensional deformations in twisted flexoelectric nematic cells.(Wydawnictwo Politechniki Łódzkiej, 2016) Derfel, Grzegorz; Buczkowska, MariolaElectric field induced deformations occurring in twisted nematic cells filled with liquid crystalline material possessing flexoelectric properties were simulated numerically. The aim of computations was to compare the two-dimensional periodic deformations with one-dimensional distortions reported in our earlier paper occurring in the same cells. It was found that the periodically deformed structures have lower free energy counted per unit area of the layer than the one-dimensional deformations.Pozycja Photo-enhanced conduction in inhomogeneous thin film space charge limited conducting systems.(Wydawnictwo Politechniki Łódzkiej, 2016) Bąk, Grzegorz W.Photo-enhancement of space-charge limited currents in deliberately modified thin-film structures is studied using numerical methods. The obtained results suggest that it should be possible to obtain optically induced increase in current density of the order of 107 in modified thin film structures as a result of deliberate modification of trap density at the emitter consisting in formation of high density of traps at the emitter.